Question

The opening and closing of pores is a function performed by

• A. Stomata
• B. Chlorophyll
• C. Chloroplast
• D. Guard cells

Answer 1

The correct option is D

Guard cells

The correct option is D.

Explanation of the correct option:

Option D:

1. The cells that regulate the opening and closing of stomata in the leaf of a plant are guard cells.
2. Such cells are in the form of a bean and encircle the stoma.
3. These are all the epidermal cells and opening and closing stomata, that assist in the exchange of gases.
4. These also play a significant role in transpiration and reduced water loss and a big feature of these guard cells is light.
5. By the osmosis phase, the guard cells control the opening and closing of stomatal pores.

Explanations of the incorrect options:

Option A:

1. Stomata are the tiny openings present on the epidermis of leaves. We can see stomata under the light microscope.
2. In some plants, stomata are present on stems and other parts of plants.
3. Stomata play an important role in gaseous exchange and photosynthesis.
4. They control by transpiration rate by opening and closing.

Option B:

1. The chlorophyll pigment is responsible for the green coloration in plants.
2. Chlorophyll is one among a group of pigments used to convert sunlight energy into chemical energy through the process of photosynthesis.
3. Chlorophyll absorbs energy from sunlight, and this energy is later used to convert carbon dioxide into carbohydrates.
4. The by-product of this process is oxygen.

Option C:

1. Plants form the basis of all life on earth and are known as producers.
2. Plant cells contain structures known as plastids which are absent in animal cells.
3. These plastids are double-membraned cell organelles that play a primary role in the manufacturing and storing of food.

Final answer: Opening and closing of pores is a function performed by Guard cells.